PWM整流器的改进虚拟磁链定向矢量控制

针对PWM整流器虚拟磁链定向矢量控制(VFOC)策略中存在因积分初始值选取不当造成的直流偏移问题,设计了改进的带饱和限幅反馈环节积分器的虚拟磁链观测器.对基于纯积分器、惯性环节以及所提出改进方法的3种虚拟磁链观测器进行了对比分析,并给出了基于改进VFOC的PWM整流器系统的仿真与实验波形.结果表明,所提出改进方法在任意交流电压初始相位情况下均很好地观测出了虚拟磁链,证明了所提出的改进控制策略的正确性和可行性.

Improved virtual flux oriented vector control of PWM rectifier

To solve the DC drift problem caused by a wrong initial value selecting of integer in virtual flux oriented vector control for PWM rectifier,an improved virtual flux observer based on an integrator with saturable amplitude limited feedback loop was proposed.And comparative analyses of three kinds of virtual flux observers based on pure integrator,inertia loop and the proposed method were performed respectively.The simulation and experimental results of the PWM rectifier control system are given based on the improved VFOC.The results show that the proposed method can observe the virtual flux well despite the initial phase of the input line voltage,and conforms the validity and feasibility of the proposed improved control strategy.